1 What type of lever has the effort between the fulcrum and the load? A First-class lever B Second-class lever C Third-class lever D Fourth-class lever
3 What is the mechanical advantage of a machine? A The number of parts in the machine B The ratio of output force to input force C The speed of the machine D The size of the machine
4 Which simple machine is used in a bicycle? A Only levers B Only pulleys C Wheel and axle and levers D Only inclined planes
5 What is the effort in a lever? A The object being moved B The force applied C The pivot point D The resistance force
7 Which of the following is an example of a first-class lever in the body? A Your arm lifting an object B Your neck muscles C Your leg muscles D Your jaw
8 What type of pulley is fixed to a support and does not move? A Movable pulley B Compound pulley C Fixed pulley D Block and tackle
9 What is a wheel and axle? A A simple machine consisting of two wheels of different sizes B A rigid bar C A sloped surface D A screw
10 What is the main advantage of using simple machines? A They reduce the amount of force needed B They reduce the amount of work C They reduce friction D They increase speed
11 What is the function of a pulley system? A To change direction of force and multiply effort B To increase speed C To reduce friction D To store energy
12 Why do simple machines not reduce the total work done? A Because friction increases work B Because they only change the direction of force C Because they multiply force but not distance D Because work is always the same
13 What type of lever has the load between the fulcrum and the effort? A First-class lever B Second-class lever C Third-class lever D Fourth-class lever
14 Which of the following is an example of a second-class lever? A Seesaw B Tweezers C Nutcracker D Fishing rod
16 What is the advantage of using a fixed pulley? A It multiplies force B It changes the direction of the force C It increases speed D It reduces friction
17 What is an inclined plane? A A flat surface raised at an angle B A wheel with a rope C A rigid bar D A spiral groove
18 What is a screw? A A simple machine with a long inclined plane wrapped around a cylinder B A wheel with a rope C A rigid bar D A flat surface
19 What is the relationship between the length of the effort arm and the mechanical advantage? A Longer effort arm gives greater mechanical advantage B Shorter effort arm gives greater mechanical advantage C Length does not affect mechanical advantage D Only the load arm matters
20 What is the fulcrum of a lever? A The point where effort is applied B The object being moved C The pivot point D The force applied
21 What is the formula for mechanical advantage of a lever? A MA = Load / Effort B MA = Effort / Load C MA = Distance / Time D MA = Force × Distance
22 Which of the following is an example of a third-class lever? A Seesaw B Nutcracker C Tweezers D Wheelbarrow
23 What is the principle of a simple machine? A It increases work B It makes work easier by changing force or distance C It reduces friction D It eliminates energy loss
24 What is a movable pulley? A A pulley attached to a fixed support B A pulley that moves with the load C A pulley with multiple wheels D A pulley that changes direction